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Evaluation of Biaxial Strength Deterioration for Coastal Bridge Piers under Non-uniform Corrosion
Wenting Yuan,Qinghe Fang,Zhaoxing Dong 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
Coastal bridge piers in the corrosive marine environment inevitably deteriorate over time, leading to a reduction in their strength. In the present study, a biaxial strength prediction method for non-uniform corroded bridge piers under axial force and biaxial bending moments is proposed by extending the applicable range of the load contour method. First, a method to establish the three-dimensional interaction surface is developed on the basis of the fiber-section model, which considers the two-dimensional chloride diffusion, the degradation of reinforcement and concrete. The proposed methodology is verified by a biaxial quasi-static test of the locally corroded bridge column specimens. Then, through further case study, the time-dependent characteristics of the interaction surface for bridge piers in the splash and tidal region and the atmospheric region are investigated. Finally, the expression of surface exponent is obtained from the interaction surface, which can be used in Bresler’s load contour method to evaluate the deterioration in the biaxial strength of coastal bridge piers. The analytical results conclude that the expression of surface exponent can be divided into three stages including the constant stage, decrease stage and increase stage during the pier’s service life. Axial compression ratio and corrosion degree are two important factors which influence the biaxial strength deterioration for different corrosion regions of the coastal bridge pier.
Wenting Xu,이미경 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.7
Solid lipid nanoparticles (SLNs) and nanostructured lipid carriers (NLCs) were prepared as delivery system for water-insoluble anticancer agent, paclitaxel (PTX). The dispersion of SLNs was consisted of 5 % w/w tristearin, 3.75 % w/w egg phosphatidylcholine (egg PC) and 1 % w/w polysorbate 80 in water. NLCs were prepared using the same composition as SLNs except that 10 % of the solid lipid was replaced by triolein. PTX was incorporated into SLNs and NLCs to attain 0.025 % w/w in the dispersion. The particle size of the prepared SLNs and NLCs were 167.9 ± 21.3 and 121.9 ± 28.3 nm, respectively, and slightly increased to 239.1 ± 32.6 and 183.6 ± 36.2 nm by PTX incorporation. PTX incorporation also increased polydispersity index suggesting broader size distribution compared to that for empty particles. SLNs and NLCs showed sustained release of PTX in cell culture media containing 10 % fetal bovine serum at 37 ˚C compared to the commercial micellar formulation consisted of Cremophor EL and ethanol. PTX in SLNs and NLCs showed comparable cytotoxicity to the commercial formulation and free PTX against human breast cancer cell line, MCF-7. On the contrary, PTX in SLNs and NLCs showed higher anticancer activity against multidrug resistant (MDR) cancer cell line, MCF-7/ADR, compared to the free PTX delivered in DMSO, which indicates that both SLNs and NLCs would be effective carriers to avoid efflux pump expressed in MDR cancer cells. In conclusion, the SLNs and NLCs prepared in the present study showed similar characteristics each other and both can be used as effective delivery system for PTX.
Wenting Zha,Junyong Zhai,Shumin Fei 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
This paper addresses the global adaptive control problem for a class of uncertain stochastic nonlinearsystems in the output-feedback form. Due to the unknown output gain, we construct a full-order homogeneousobserver instead of using the system output. Then, by adding a power integrator technique, an output-feedbackcontroller is designed, as well as an adaptive law to deal with the unknown nonlinear growth rates. Based on thegeneralized stochastic Lyapunov stability theorem, it can be proved that all the signals of the closed-loop systemare bounded in probability, and the system states converge to the origin almost surely.
Formation of MgCO3 3H2O in the CO2 mineralization system using Mg (OH)2 as an intermediate at 20 C
Wenting Cheng,Li Fang,Huaigang Cheng,Enze Li,Cuiyu Zhang,Fangqin Cheng 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
The formation of MgCO3 3H2O in the CO2 mineralization system was investigated using Mg(OH)2 as anintermediate at 20 C. Liquid and solid analyses were done for qualitative and quantitative compositioncharacterizations of the reacted samples. Results showed that the morphology of Mg(OH)2 had anobvious effect on the growth rate, size and morphology of MgCO3 3H2O. The formation of MgCO3 3H2Omight be explained by the dissolution–recrystallization mechanism. Larger bundle-like MgCO3 3H2Owhich composed of middle-binding rod crystals was obtained from the plate-like Mg(OH)2. Thesefindings could pave the way for controllable crystallization of MgCO3 3H2O in a CO2 mineralizationsystem.
Access-Authorizing and Privacy-Preserving Auditing with Group Dynamic for Shared Cloud Data
( Wenting Shen ),( Jia Yu ),( Guangyang Yang ),( Yue Zhang ),( Zhangjie Fu ),( Rong Hao ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.7
Cloud storage is becoming more and more popular because of its elasticity and pay-as-you-go storage service manner. In some cloud storage scenarios, the data that are stored in the cloud may be shared by a group of users. To verify the integrity of cloud data in this kind of applications, many auditing schemes for shared cloud data have been proposed. However, all of these schemes do not consider the access authorization problem for users, which makes the revoked users still able to access the shared cloud data belonging to the group. In order to deal with this problem, we propose a novel public auditing scheme for shared cloud data in this paper. Different from previous work, in our scheme, the user in a group cannot any longer access the shared cloud data belonging to this group once this user is revoked. In addition, we propose a new random masking technique to make our scheme preserve both data privacy and identity privacy. Furthermore, our scheme supports to enroll a new user in a group and revoke an old user from a group. We analyze the security of the proposed scheme and justify its performance by concrete implementations.
Effect of Biaxial Loading Path on Seismic Performance of RC Bridge Piers with Corrosion Damage
Wenting Yuan,Yuren Wang,Peng Zhou,Wei Yuan,Yadong Yao 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12
In recent years, the deterioration of seismic behavior for reinforced concrete (RC) bridges due to reinforcement corrosion has received increasing attention. Many studies have been performed to explore the seismic capacity of corroded piers by applying uniaxial cyclic loading. However, the uniaxial seismic responses of corroded piers cannot accurately reflect the true structural response influenced by corrosion condition and real multidimensional earthquake action. Pointing at this problem, in this study, the seismic performance of corroded pier columns suffering biaxial lateral cyclic loadings is investigated by conducting comprehensive numerical analyses. First, a fiber-based numerical model is built and verified by the cyclic experiment results of two RC pier columns under different displacement loading patterns and corrosion levels. Then, three corrosion levels and five uniaxial and biaxial displacement protocols are used in the verified numerical models. The simulation results show that the ultimate force, deformation capacity, and dissipated energy of the piers are significantly influenced by corrosion degrees and biaxial loading patterns compared with the uniaxially loaded uncorroded piers. The phase lag between the biaxial displacement trajectory and biaxial force trajectory has three stages: a small-range fluctuation stage, a wide-range fluctuating and rise stage, and a wide-range fluctuating and decrease stage. The RE pattern is the most detrimental pattern, which leads to the fastest damage accumulation of the same-level corroded bridge piers.